Involucre

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1. overlapping bracts around an inflorescence.

involucre_bracts-01cm.jpg

Photo with the involucre and bract identified.
Source: http://www.plantstogrow.com/Botany/fact_pages/pages/involucre.htm

spathe.JPG

The involucre is shown at the base of the flower.
Source: https://www.msu.edu/course/bot/423/flwrprts.htm